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use Map instead of Array with sort

 const input = 'i wanter Cats and dogs.'



const convert = (input)=>{
const arr = input.substring(0, input.length - 1).split(' ')
const result = new Map()
arr.forEach(item=> {
const key = item.length
if (result.has(key)){
result.set(item.length, result.get(key) + ' ' + item)
} else
result.set(item.length, item)
})

const sorted = new Map([...result.entries()].sort())

let sentense = ''
const values = Array.from(sorted.values())
values.forEach((value, i)=>{
const word = value.toLowerCase()
if (i ===0 )
sentense = sentense.concat(word.substring(0,1).toUpperCase()).concat(word.substring(1))
else
sentense = sentense.concat(word)

if (i === values.length -1)
sentense = sentense.concat('.')
else
sentense = sentense.concat(' ')
})
return sentense
}

console.log(convert(input))

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